<template>
  <div class="xtx-numbox">
    <!-- =={{ max }} -->
    <div class="label">数量</div>
    <div class="numbox">
      <a href="javascript:;" @click="decrease">-</a>
      <input type="text" readonly :value="valueNum" />
      <a href="javascript:;" @click="add">+</a>
      <!-- <a href="javascript:;" :disabled="valueNum>=max" @click="add">+</a> -->
    </div>
  </div>
</template>
<script>
import { ref, watch } from "vue";
export default {
  name: "xtxNumbox",
  props: {
    max: {
      type: [String, Number],
      default: 5,
    },
    min: {
      type: [String, Number],
      default: 1,
    },
    modelValue: {
      type: Number,
      default: 1,
    },
  },
  setup(props, { emit }) {
    /* 
    1-加  自增
    2-减  自减
    */
    // const valueNum = ref(props.modelValue);
    const valueNum = ref(3);
    watch(
      () => props.modelValue,
      (newVal) => {
        valueNum.value = newVal;
      },
      {
        immediate: true,
      }
    );

    const decrease = () => {
      if (valueNum.value <= props.min) {
        valueNum.value = props.min;
        return;
      }
      valueNum.value--;
      emit("update:modelValue", valueNum.value);
      emit("change", valueNum.value);
    };
    const add = () => {
      if (valueNum.value >= props.max) {
        valueNum.value = props.max;
        return;
      }
      valueNum.value++;
      emit("update:modelValue", valueNum.value);
      emit("change", valueNum.value);
    };
    return { decrease, add, valueNum };
  },
};
</script>
<style scoped lang="less">
.xtx-numbox {
  display: flex;
  align-items: center;
  margin: 10px 0;
  .label {
    width: 60px;
    color: #999;
    padding-left: 10px;
  }
  .numbox {
    width: 120px;
    height: 30px;
    border: 1px solid #e4e4e4;
    display: flex;
    > a {
      width: 29px;
      line-height: 28px;
      text-align: center;
      background: #f8f8f8;
      font-size: 16px;
      color: #666;
      &:first-of-type {
        border-right: 1px solid #e4e4e4;
      }
      &:last-of-type {
        border-left: 1px solid #e4e4e4;
      }
    }
    > input {
      width: 60px;
      padding: 0 5px;
      text-align: center;
      color: #666;
    }
  }
}
</style>
